CN113216012A - Construction method for applying pre-pressure to bottom formwork without stacking - Google Patents
Construction method for applying pre-pressure to bottom formwork without stacking Download PDFInfo
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- CN113216012A CN113216012A CN202110553537.0A CN202110553537A CN113216012A CN 113216012 A CN113216012 A CN 113216012A CN 202110553537 A CN202110553537 A CN 202110553537A CN 113216012 A CN113216012 A CN 113216012A
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- cradle
- jack
- truss
- hanging basket
- construction
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
- E01D21/10—Cantilevered erection
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- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a construction method for applying pre-pressure to a bottom template without stacking, which comprises the following steps of firstly carrying out pouring construction on a pier and a No. 0 beam, and embedding an anchoring bolt on the side surface of the No. 0 beam during pouring construction; then, a cradle truss is installed on the No. 0 beam, and then a cradle is installed on the cradle truss through steel stranded wires, wherein the steel stranded wire at the foremost end is installed on a center penetrating jack at the front end of the cradle truss; a bottom template is arranged on the hanging basket; installing a counter-force support on the anchor bolt, installing a pre-pressing jack below the counter-force support, and installing a distribution beam between the pre-pressing jack and the bottom template; and starting the prepressing jack to prepress the bottom template, and when the cradle deforms, starting the piercing jack to adjust the height of the steel strand at the front end of the cradle, maintaining the cradle not to deform, and completing the prepressing. The method has the advantages of short construction period and capability of adjusting the pre-pressing load in real time according to actual conditions in the aspect of construction.
Description
Technical Field
The invention belongs to the field of bridge construction, relates to a bridge construction prepressing technology, and particularly relates to a construction method for applying prepressing force to a bottom template in a non-stacking mode.
Background
The existing construction method of the bottom formwork of the bridge mainly comprises the steps of using a crane to hang heavy objects (steel materials and sandbags) on a cast-in-place plate and applying pre-pressure to the cast-in-place plate, wherein the method has the following defects:
(1) the sandbags and the steel are single and scattered, and uniform pre-pressure is difficult to be applied to the bottom template as a whole.
(2) The upper layer of the bottom template is ballasted by the upward force transmitted by the lower layer, the transmission force arm is too long, and the efficiency is low.
(3) After the pre-pressing operation is completed, the crane is required to lift the heavy object away, and the construction can be continued.
(4) The upper steel beam cannot offset part of the load without applying pre-stress.
(5) The lower steel beam can be bent and deformed during prepressing
Jacks are often used in factories, mines, transportation and other sectors for vehicle repair and other lifting, supporting and other work. The structure is light, firm, flexible and reliable, and the portable multifunctional electric water heater can be carried and operated by one person and is very light. The reaction frame is a alias of the beam support, and is used for a support under the beam in a mixed structure and transmitting the force dispersion of the beam support to a bearing weight under the beam support. The jack can provide the stress required by the preloading of the bottom formworks, but the jack is not used for the preloading of the bottom formworks in the bridge construction process in the prior art.
Disclosure of Invention
The invention aims to provide a construction method for applying pre-pressure to a bottom formwork without stacking. Specifically, the jack is arranged on the cantilever beam of the reaction frame, the cantilever beam is used as a reaction support of the reaction frame, the jack can transmit force to the lower part, the pre-pressure can be uniformly loaded on the bottom template by matching and distributing beams, meanwhile, the steel strand at the front end of the cradle is arranged on the cradle truss through the center penetrating jack, the length of the steel strand at the front end of the cradle is adjusted through the center penetrating jack, and therefore the deformation degree of the cradle is adjusted.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a construction method for applying pre-pressure to a bottom template in a non-stacking mode is characterized by comprising the following steps:
firstly, pouring a pier according to a drawing through reconnaissance and geological data, performing No. 0 beam pouring construction on the pier, and embedding an anchoring bolt on the side surface of the No. 0 beam during pouring construction;
secondly, installing a rail on the No. 0 beam, installing a cradle truss on the rail, and arranging a center-penetrating jack at the front end of the cradle truss;
step three, hanging and installing a hanging basket on a hanging basket truss in a hanging mode, arranging a center-penetrating jack and a tension rod at the front end of the hanging basket truss, fixing the center-penetrating jack at the front end of the hanging basket truss, connecting the lower end of the tension rod with the front end of the hanging basket, and connecting the upper end of the tension rod with the center-penetrating jack;
fourthly, mounting a bottom template on the hanging basket;
installing a counter-force support on the anchoring bolt, installing a pre-pressing jack below the counter-force support, and installing a distribution beam between the pre-pressing jack and the bottom template;
starting a prepressing jack to prepress the bottom template, and when the cradle deforms, starting a piercing jack to pull the front end of the cradle upwards through a tensioning rod to maintain the cradle not to deform;
step seven, after the prepressing is finished, removing the prepressing jack and the counter-force support, then carrying out pouring construction on the No. 1 beam, and embedding an anchoring bolt on the side surface of the front end of the No. 1 beam in the construction process;
and step eight, repeating the step two to the step seven until the construction of the whole cantilever beam is completed.
And further, in the second step, the track is made of track steel, the hanging basket truss is a triangular truss, and I-shaped steel is adopted as temporary support between the hanging basket truss and the No. 0 beam during prepressing.
Further, the basket hanging truss is made of Bailey beams.
Furthermore, the pre-compaction jack has 2, installs respectively in the cantilever beam both sides.
Furthermore, the distributing beams comprise transverse distributing beams and longitudinal distributing beams, the longitudinal distributing beams are placed on the bottom formwork, the transverse distributing beams are placed on the longitudinal distributing beams, and the pre-pressing jacks are pressed on the transverse distributing beams.
Furthermore, the plurality of the penetrating jacks are also arranged, and the plurality of the penetrating jacks are transversely distributed at the front end of the cradle truss.
And further, in the sixth step, observing whether the cradle deforms or not through the total station.
Furthermore, the periphery of the hanging basket is hung on the basket truss through a plurality of steel strands or steel belts.
The invention has the following beneficial effects:
the invention uses the prepressing jack to provide ballast, and can conveniently adjust the magnitude of the prepressing load.
And (II) uniform and constant ballast, and the problem of uneven pressure caused by using materials such as sand bags and the like can be solved.
And (III) the space on the bridge bottom template is small, the stacking method is too messy, and the invention only uses the reaction frame and the jack, thereby saving a large amount of space.
And (IV) excessive heavy objects do not need to be hung, and the crane can perform other operations, so that the utilization rate of the engineering machinery is improved.
And fifthly, the height of the steel strand at the front end of the cradle is adjusted through the center-penetrating jack, so that the cradle is kept not to deform.
Drawings
Fig. 1 is a schematic view of a pier and a No. 0 beam of the present invention.
FIG. 2 is a schematic view of the construction method for applying pre-pressure to the bottom form without stacking.
Fig. 3 is a right side view of fig. 2.
Fig. 4 is a schematic view of the completion of casting of beam No. 1.
In the drawings 1-anchor bolt; 2-prepressing a jack; 3-longitudinal distribution beams; 4-a counter-force bracket; 5-bottom template; 6-0 beam; beam 7-1; 8-hanging basket trusses; 9-tensioning a pull rod; 10-truss bottom steel beam; 11-a center-penetrating jack; 12-hanging basket bottom plates, 13-piers, 14-rails, 15-I-shaped steel, 16-transverse distribution beams and 17-steel strips.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
As shown in fig. 1 to 4, the present invention provides a construction method for applying a pre-pressure to a bottom form without stacking, which comprises the following specific steps:
firstly, pouring a pier 13 according to a drawing through reconnaissance and geological data, performing pouring construction on a No. 0 beam 6 on the pier 13, and embedding an anchoring bolt 1 on the side surface of the No. 0 beam 6 during pouring construction;
secondly, installing a rail 14 on the No. 0 beam 6, installing a cradle truss 8 on the rail 14, and arranging a center-penetrating jack 11 at the front end of the cradle truss 8;
thirdly, hanging baskets are hung and installed on the basket hanging truss 8 through steel belts 17, the lower ends of the steel belts 17 are connected to a basket hanging bottom plate 12, tension rods are installed in tension heads of the penetrating jacks 11, and the lower ends of the tension rods 9 are connected with the front end of the baskets (fixed on a cross beam at the front end of the basket hanging bottom plate 12);
fourthly, mounting a bottom template 5 on the hanging basket;
installing a counter-force support 4 on the anchor bolt 1, installing a pre-pressing jack 2 below the counter-force support 4, and installing a distribution beam between the pre-pressing jack 2 and a bottom template 5;
step six, starting a pre-pressing jack 2 to pre-press a bottom template 5, and when the cradle deforms, starting a penetrating jack 11 to adjust the height of the front end of the cradle through a tension rod 9 (pull the front end of the cradle upwards) to maintain the cradle not to deform;
step seven, after the prepressing is finished, removing the prepressing jack 2 and the counter-force support 4, then carrying out pouring construction on the No. 1 beam 7, and embedding the anchoring bolt 1 on the side surface of the front end of the No. 1 beam 7 in the construction process;
and step eight, repeating the step two to the step seven until the construction of the whole cantilever beam is completed.
In the second step, the rails 14 are made of rail steel, the cradle truss 8 is a triangular truss, and the I-shaped steel 15 is used as a temporary support between the cradle truss 8 and the No. 0 beam 6 during prepressing.
In a preferred embodiment, the cradle truss 8 is made of a beret beam.
As a preferred embodiment, 2 pre-compaction jacks 2 are respectively arranged at two sides of the cantilever beam.
As a preferred embodiment, the distribution beam comprises a transverse distribution beam 16 and a longitudinal distribution beam 3, the longitudinal distribution beam 3 is placed on the bottom formwork 5, the transverse distribution beam 16 is placed on the longitudinal distribution beam 3, and the pre-compression jacks 2 are pressed on the transverse distribution beam 16.
In a preferred embodiment, there are two penetrating jacks 11, and the two penetrating jacks 11 are transversely distributed at the front end of the cradle truss 8.
As a preferred embodiment, in step six, whether the cradle is deformed or not is observed through the total station.
The above embodiments are merely illustrative of the present invention and are not to be construed as limiting the invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and the technical solution of the present invention is covered by the claims of the present invention.
Claims (8)
1. A construction method for applying pre-pressure to a bottom template in a non-stacking mode is characterized by comprising the following steps:
firstly, pouring a pier according to a drawing through reconnaissance and geological data, performing No. 0 beam pouring construction on the pier, and embedding an anchoring bolt on the side surface of the No. 0 beam during pouring construction;
secondly, installing a rail on the No. 0 beam, installing a cradle truss on the rail, and arranging a center-penetrating jack at the front end of the cradle truss;
step three, hanging and installing a hanging basket on a hanging basket truss in a hanging mode, arranging a center-penetrating jack and a tension rod at the front end of the hanging basket truss, fixing the center-penetrating jack at the front end of the hanging basket truss, connecting the lower end of the tension rod with the front end of the hanging basket, and connecting the upper end of the tension rod with the center-penetrating jack;
fourthly, mounting a bottom template on the hanging basket;
installing a counter-force support on the anchoring bolt, installing a pre-pressing jack below the counter-force support, and installing a distribution beam between the pre-pressing jack and the bottom template;
starting a prepressing jack to prepress the bottom template, and when the cradle deforms, starting a piercing jack to pull the front end of the cradle upwards through a tensioning rod to maintain the cradle not to deform;
step seven, after the prepressing is finished, removing the prepressing jack and the counter-force support, then carrying out pouring construction on the No. 1 beam, and embedding an anchoring bolt on the side surface of the front end of the No. 1 beam in the construction process;
and step eight, repeating the step two to the step seven until the construction of the whole cantilever beam is completed.
2. The construction method for applying the pre-pressure to the bottom formworks without the surcharge according to claim 1, wherein: and in the second step, the track is made of track steel, the hanging basket truss is a triangular truss, and I-shaped steel is adopted as temporary support between the hanging basket truss and the No. 0 beam during prepressing.
3. The construction method for applying the pre-pressure to the bottom formworks without the surcharge according to claim 1, wherein: the hanging basket truss is made of Bailey beams.
4. The construction method for applying the pre-pressure to the bottom formworks without the surcharge according to claim 1, wherein: and 2 pre-pressing jacks are respectively arranged on two sides of the cantilever beam.
5. The construction method for applying the pre-pressure to the bottom formworks without the surcharge according to claim 1, wherein: the distributing beams comprise transverse distributing beams and longitudinal distributing beams, the longitudinal distributing beams are placed on the bottom formwork, the transverse distributing beams are placed on the longitudinal distributing beams, and the prepressing jacks are pressed on the transverse and transverse distributing beams.
6. The construction method for applying the pre-pressure to the bottom formworks without the surcharge according to claim 1, wherein: the plurality of the penetrating jacks are also arranged at the front end of the cradle truss in a transverse distribution mode.
7. The construction method for applying the pre-pressure to the bottom formworks without the surcharge according to claim 1, wherein: and step six, observing whether the cradle deforms or not through a total station.
8. The construction method for applying the pre-pressure to the bottom formworks without the surcharge according to claim 1, wherein: the periphery of the hanging basket is hung on the basket truss through a plurality of steel strands or steel belts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110553537.0A CN113216012A (en) | 2021-05-20 | 2021-05-20 | Construction method for applying pre-pressure to bottom formwork without stacking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110553537.0A CN113216012A (en) | 2021-05-20 | 2021-05-20 | Construction method for applying pre-pressure to bottom formwork without stacking |
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| Publication Number | Publication Date |
|---|---|
| CN113216012A true CN113216012A (en) | 2021-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110553537.0A Pending CN113216012A (en) | 2021-05-20 | 2021-05-20 | Construction method for applying pre-pressure to bottom formwork without stacking |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103952982A (en) * | 2014-05-13 | 2014-07-30 | 中交二航局第三工程有限公司 | Preloading device and preloading method for hanging basket anchorage pull rod-type jack of bridge box girder |
| CN204849607U (en) * | 2015-06-03 | 2015-12-09 | 中铁建大桥工程局集团第五工程有限公司 | A continuous beam string basket pre -compaction device for bridge construction |
| CN205934747U (en) * | 2016-07-29 | 2017-02-08 | 中铁十八局集团第五工程有限公司 | A hang basket that is used for cantilever to pour bridge construction operation with pre -compaction structure |
| CN106702906A (en) * | 2016-12-09 | 2017-05-24 | 中铁八局集团昆明铁路建设有限公司 | Pre-pressing device for hanging baskets and pre-pressing method thereof |
| CN110359374A (en) * | 2019-07-29 | 2019-10-22 | 中铁七局集团路桥工程有限公司 | A kind of Hanging Basket precompressed counter-force bracket and its construction method |
-
2021
- 2021-05-20 CN CN202110553537.0A patent/CN113216012A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103952982A (en) * | 2014-05-13 | 2014-07-30 | 中交二航局第三工程有限公司 | Preloading device and preloading method for hanging basket anchorage pull rod-type jack of bridge box girder |
| CN204849607U (en) * | 2015-06-03 | 2015-12-09 | 中铁建大桥工程局集团第五工程有限公司 | A continuous beam string basket pre -compaction device for bridge construction |
| CN205934747U (en) * | 2016-07-29 | 2017-02-08 | 中铁十八局集团第五工程有限公司 | A hang basket that is used for cantilever to pour bridge construction operation with pre -compaction structure |
| CN106702906A (en) * | 2016-12-09 | 2017-05-24 | 中铁八局集团昆明铁路建设有限公司 | Pre-pressing device for hanging baskets and pre-pressing method thereof |
| CN110359374A (en) * | 2019-07-29 | 2019-10-22 | 中铁七局集团路桥工程有限公司 | A kind of Hanging Basket precompressed counter-force bracket and its construction method |
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Application publication date: 20210806 |